Java8 Time Usage Summary

Localdate represents a date for an iOS format (YYYY-MM-DD) Gets the current date: localdate localdate = Localdate.now ();//localdate: Indicates a date without a time zone. Localdate is immutable and thread-safe System.out.println ("localdate:" + localdate);//localdate:2017-08-24//localdate can specify a specific date, Call the of or Parse method to return the instance: System.out.println (Localdate.of, ());//2017-07-20system.out.println (Localdate.parse ( "2017-07-20");//2017-07-20//add a day for today, that is to get tomorrow System.out.println (Localdate.now (). Plusdays (1));//2017-08-25// Add 7 days for today, that is, to get a week after the Today System.out.println (Localdate.now (). Plusweeks (1));//2017-08-31//adds one months to today, That is to get one months later today System.out.println (Localdate.now (). Plusmonths (1));//2017-09-24//adds a year to today, That is to get a year later today System.out.println (Localdate.now (). Plusyears (1));//2018-08-24//minus one months from today (plus the same can be obtained minus 1 days, a week, 1 years after the time) System.out.println (Localdate.now (). Minus (1, chronounit.months));//2017-07-24system.out.println (Localdate.now (). Minusmonths (1));//2017-07-24//resolution date 2017-07-20, gets the week of the week and the day of the month, etc. System.out.println ("Thursday:" +localdate.parse (" 2017-07-20 "). GetDayOfWeek ());//thursdaysystem.out.println("Day:" +localdate.parse ("2017-07-20"). GetDayOfMonth ());//20system.out.println ("Month:" +localdate.parse ("2017-07-20") . Getmonthvalue ());//7system.out.println ("Year:" +localdate.parse ("2017-07-20"). GetYear ());//2017system.out.println ("Month:" +localdate.parse ("2017-07-20"). GetMonth ());//july//is not a leap year (leap years judgment) System.out.println (Localdate.now (). Isleapyear ());//false//determines whether before or after the date: System.out.println (Localdate.parse ("2017-07-20"). Isafter (Localdate.parse (" 2017-07-21 "));//falsesystem.out.println (Localdate.parse (" 2017-07-20 "). Isbefore (Localdate.parse (" 2017-07-21 ")) );//truesystem.out.println (Localdate.parse ("2217-07-20"). Isbefore (Localdate.parse ("2017-07-21"));//false// Get the first day of the Month: System.out.println (Localdate.parse ("2017-07-20"). With (Temporaladjusters.firstdayofmonth ()));// 2017-07-01//get the first day of next month, etc... System.out.println (Localdate.parse ("2017-07-20"). With (Temporaladjusters.firstdayofnextmonth ()));// 2017-08-01system.out.println (Localdate.parse ("2017-07-20"). With (Temporaladjusters.lastdayofmonth ()));// 2017-07-31System.out.println (Localdate.parse ("2017-07-20"). With (Temporaladjusters.firstdayofnextyear ()));// 2018-01-01system.out.println (Localdate.parse ("2017-07-20"). With (Temporaladjusters.firstdayofyear ()));// 2017-01-01//judge whether today is my birthday, for example my birthday is 2006-07-20localdate birthday = Localdate.of (2006, 07, 20); MonthDay Birthdaymd = Monthday.of (Birthday.getmonth (), Birthday.getdayofmonth ()); MonthDay Today=monthday.from (Localdate.now ()); System.out.println ("Whether today is my birthday:" + today.equals (BIRTHDAYMD));//falsesystem.out.println ("=======localtime represents a time, Instead of the date =========== ");//Get the current time 09:52:19.446system.out.println (" Present Time: "+localtime.now ());// Resolves a string time to LocalTimeSystem.out.println (Localtime.parse ("15:02")), and//15:02//creates a time System.out.println using the static method ( Localtime.of (16, 02));//16:02//uses parsing strings and adds an hour, output 16:02system.out.println (Localtime.parse ("15:02"). Plus (1, chronounit.hours));//16:02system.out.println (Localtime.parse ("15:02"). Plus (chronounit.minutes));//15:12// Gets the hour, Minute System.out.println (Localtime.parse ("15:02") of the time. GethOur ());//15system.out.println (Localtime.parse ("15:02"). Getminute ());//2//Check if one time is before and after another time System.out.println (Localtime.parse ("15:02"). Isafter (Localtime.parse ("14:02"));//truesystem.out.println (Localtime.parse ("15:02") . Isbefore (Localtime.parse ("14:02")))//false//the start and end times of each day System.out.println (Localtime.max);// 23:59:59.999999999system.out.println (localtime.min);//00:00system.out.println ("=======localdatetime is used to represent the date and time , which is one of the most commonly used classes of =========== "); System.out.println ("Now:" +localdatetime.now ());//2017-08-24t10:31:03.600// LocalDateTime also provides APIs for adding or subtracting dates and times System.out.println ("Tomorrow's Now:" +localdatetime.now (). Plusdays (1));// 2017-08-25t10:33:05.363//get the current month and so on System.out.println (Localdatetime.now (). Getmonthvalue ());//8system.out.println (Localdatetime.now (). GetMonth ());//augustsystem.out.println (Localdatetime.now (). GetYear ());//2017// Date format System.out.println ("====== date format ======="); LocalDateTime now = Localdatetime.now ();D atetimeformatter datetimeformatter = Datetimeformatter.ofpattern (" YYYY-MM-DD hh:mM:ss "); SYSTEM.OUT.PRINTLN ("Default format:" + now); SYSTEM.OUT.PRINTLN ("Custom format:" + Now.format (datetimeformatter)); LocalDateTime LocalDateTime = Localdatetime.parse ("2017-07-20 15:27:44", datetimeformatter); System.out.println ("String goto localDateTime:" + Localdatetime.format (datetimeformatter));D Atetimeformatter datetimeformatter_s = Datetimeformatter.ofpattern ("Yyyy-mm-dd"); String datestring = Datetimeformatter_s.format (Localdate.now ()); System.out.println ("Date to String:" + datestring);//The date and period period class is used to modify the difference between a given date or two dates obtained. Localdate initialdate = Localdate.parse ("2017-07-20"); Localdate finaldate = Initialdate.plus (Period.ofdays (5));//Add 5 days to the initialized date System.out.println ("Initialize Date:" + initialdate);// 2017-07-20system.out.println ("Add date after:" + finaldate),//2017-07-25//period (Period) API provides us with a comparison of two dates, as follows to obtain the difference in days: ( Similarly can get two time difference of hours, weeks, months, years) long between = ChronoUnit.DAYS.between (Initialdate, finaldate); System.out.println ("Gap days:" + between);//5//how to convert the date class to a time class in Java8//date and Instant convert to and from date date = Date.from (Instant.now ()); InstanT instant = date.toinstant ();//date converted to localdatetime/*localdatetime localdatetime_s = Localdatetime.from (new date ()); System.out.println (localdatetime_s); *///localdatetime to Datedate date_s =date.from (Localdatetime.atzone ( Zoneid.systemdefault ()). Toinstant ()); System.out.println (date_s);//localdate to Datedate date_t =date.from (Localdate.now (). Atstartofday (). Atzone ( Zoneid.systemdefault ()). Toinstant ()); System.out.println (date_t);

　　

Java8 Time Usage Summary